That is awesome information!
One question though. This was from the first link where he's explaining how to calculate CFM.
But in the link Cygnusx1 posted, with the L28 example, he used 1728 in his equation. I would assume one of these two articles are in error, and probably the second. Does that mean the whole rest of the guide would be worthless? The concepts are great and still the same, but I would think the data would be un usable.